EP0390422A1 - Dispositif de commande pas à pas pour soupape - Google Patents

Dispositif de commande pas à pas pour soupape Download PDF

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Publication number
EP0390422A1
EP0390422A1 EP90303083A EP90303083A EP0390422A1 EP 0390422 A1 EP0390422 A1 EP 0390422A1 EP 90303083 A EP90303083 A EP 90303083A EP 90303083 A EP90303083 A EP 90303083A EP 0390422 A1 EP0390422 A1 EP 0390422A1
Authority
EP
European Patent Office
Prior art keywords
valve
magnetic poles
movable permanent
permanent magnet
suction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90303083A
Other languages
German (de)
English (en)
Other versions
EP0390422B1 (fr
Inventor
Hideo Kawamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Ceramics Research Institute Co Ltd
Original Assignee
Isuzu Ceramics Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isuzu Ceramics Research Institute Co Ltd filed Critical Isuzu Ceramics Research Institute Co Ltd
Publication of EP0390422A1 publication Critical patent/EP0390422A1/fr
Application granted granted Critical
Publication of EP0390422B1 publication Critical patent/EP0390422B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1653—Magnetic circuit having axially spaced pole-pieces
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/12—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moving in alternate directions by alternate energisation of two coil systems

Definitions

  • This invention relates to a valve stepping drive apparatus for driving a suction/exhaust valve of an engine to open and close the valve by a linear pulse motor disposed on the shaft end portion of the valve.
  • a conventional apparatus for driving a suction/exhaust valve to open and close the same includes a cam shaft disposed on the upper portion or side face of the engine.
  • a crankshaft, which is the output shaft of the engine, and the cam shaft are connected by rotary transmission means such as a belt, and the cam shaft is driven rotatively in synchronism with the rotational phase of the engine.
  • the cam face of the cam shaft pushes the shaft end face of the suction/exhaust valve via a link mechanism such as a rocker arm or pushing rod. Accordingly, the suction/exhaust valve, which is held in the closed state at all times by a spring, is opened by pushing the shaft end face of the valve.
  • valve actuation timing of the suction/exhaust valve cannot be altered during engine operation. Therefore, the valve actuation timing is adjusted in such a manner that a high output will be attained when the engine is running at a prescribed rotational speed. As a result, engine output and efficiency decline when the engine is running at an rpm different from the prescribed rpm.
  • an object of the present invention is to provide a valve stepping drive apparatus in which drive for opening and closing a suction/exhaust valve of an engine is performed by a linear pulse motor disposed on a shaft end portion of the suction/exhaust valve, whereby the opening/closing operation can be performed stably even when the suction/exhaust valve moves.
  • a valve stepping drive apparatus comprising a movable permanent magnetic connected to a suction/exhaust valve and having a pair of magnetic poles arranged in a direction in which the suction/exhaust valve is reciprocated, fixed magnetic poles opposing the magnetic poles of the movable permanent magnet and arranged to have a spacing different from a spacing between the magnetic poles of the movable permanent magnet, fixed excitation coils wound on respective ones of the fixed magnetic poles for exciting the fixed magnetic poles, and energizing control means for controlling passage of current through the fixed excitation coils so that an electromagnetic force acts between the magnetic poles of the movable permanent magnet and the fixed magnetic poles, thereby driving the suction/exhaust valve to open and close the same.
  • valve stepping drive apparatus of the present invention successively alternates, in a predetermined sequence, the current supplied to the fixed excitation coils, whereby the electromagnetic force acting between the magnetic poles of the movable permanent magnet and the fixed magnetic poles is made to coincide with the direction in which the suction/exhaust valve reciprocates, thereby to open and close the suction/exhaust valve.
  • numeral 6 denotes an engine having an output shaft in the vicinity of which is disposed a rotation sensor 7 for sensing the rotational speed and rotational phase of the engine 6 and converting sensed speed and phase into electric signals.
  • Suction valves and exhaust valves for controlling the opening and closing of suction and exhaust ports are disposed within the engine 6.
  • the drive apparatus of the present invention is applicable to both suction valves and exhaust valves, it will be described hereinafter principally with regard to a suction valve.
  • Numeral 1 denotes a suction valve consisting of a heat-resistant, high-strength, light-weight material such as a ceramic.
  • the suction valve 1 is axially supported by a valve guide 8 so that its shaft portion may reciprocate freely.
  • a valve seat 9 is disposed at a suction port, which is the terminus of an exhaust conduit. A beveled portion of the suction valve 1 and the valve seat 9 are in intimate contact to close the suction port.
  • the shaft end side of the shaft portion of suction valve 1 is sheathed by a magnetic passageway 21 comprising a cylindrical magnetic body.
  • a circular movable permanent magnet 2 is fitted onto the outer periphery of the magnetic passageway 21 on the shaft end side thereof.
  • the movable permanent magnet 2 has a magnetic pole 22 on the N-pole side and a magnetic pole 23 on the S-pole side.
  • the poles 22, 23, which are disposed on the outer periphery of the magnet 2, are separated from each other by a spacing P in the axial direction of the suction valve 1.
  • An electromagnet 3 is disposed circumferentially of the suction valve 1 and comprises a yoke member, which includes four fixed magnetic poles 31, 32, 33, 34, spaced apart by (3/2)P, opposing the magnetic poles 22, 23 of the movable permanent magnet 2 and arrayed in a row in the direction of movement of the movable permanent magnet 2, as well as a lower magnetic pole 35 opposing the outer peripheral surface of the magnetic passageway 21, and fixed excitation coils 36, 37, 38, 39 wound on the fixed magnetic poles 31, 32, 33, 34, respectively.
  • the coils 36, 38 are wound in mutually opposite directions, and so are the coils 37, 39.
  • a spring 11 is provided between the magnetic passageway 21 and valve guide 8 to prevent the suction valve 1 from dropping when the electromagnetic 3 is not operating.
  • a position sensor 4 is provided on the lower magnetic pole 35 to sense the operating position of the suction valve 1 and output a position signal.
  • the output signals of the rotation sensor 7 and position sensor 4 enter a control unit 5 via an input/output interface 54.
  • a signal for driving the suction valve 1 is outputted to the fixed excitation coils 36, 37, 38, 39 via the input/output interface 54.
  • a signal S1 is delivered to the fixed excitation coils 36, 38 and a signal S2 is delivered to the fixed excitation coils 37, 39.
  • the control unit 5 includes, in addition to the input/output interface 54, a RAM 53 for temporarily storing data and the results of processing, a ROM 52 for storing programs and various maps, a CPU 51 for executing processing in accordance with programs stored in the ROM 52, and a control memory 55 for controlling the flow of signals within the control unit 5.
  • the control unit 5 computes the open/close speed and opening of the suction valve 1, based on the maps stored in the ROM 52, from a signal indicative of the rotational speed of the engine 6 and a signal (not shown) indicative of the amount of accelerator pedal depression.
  • the control unit 5 outputs the signals S1, S2 based on the results of this processing.
  • the suction valve 1 is driven in the opening direction, held at the position of the calculated prescribed opening and then driven in the closing direction to closing the suction port. The closed state is maintained until the next timing instant at which the valve is to be opened.
  • the suction valve 1 When the suction valve 1 is in the driven state, the position corresponding to the states of the signals S1, S2 and the position signal from the position sensor 4 are compared. If there is a disparity between the position corresponding to the states of signals S1, S2 and the actual position, the valve is returned to the closed state by a predetermined operation and fault diagnosis is performed.
  • Figs. 2(a) - (e) represent the right side of the suction valve 1 on a step-by-step basis.
  • the fixed excitation coils 36, 37, 38, 39 are deleted from the drawings.
  • the fixed excitation coils 36, 38 are wound in opposite directions as are the fixed excitation coils 37, 39, the fixed magnetic poles 31, 33 have polarities that differ from each other at all times, and so do the fixed magnetic poles 32, 34.
  • the magnetic resistance between the electromagnet 3 and the movable permanent magnet 2 is small so that the attractive and repulsive forces between the electromagnet 3 and movable permanent magnet 2 are large. As a result, the driving force that acts upon the suction valve 1 is increased.
  • Fig. 2(a) shows the suction valve 1 in its uppermost position, namely the state in which the suction port is closed.
  • the signal S2 is temporarily stopped and then reversed in direction, so that the suction valve 1 moves to the position shown in (e) of Fig. 2 upon traversing the position shown in (d) of Fig. 2.
  • the suction valve 1 moves by (3/8)P in each of the steps of (a) through (e). Accordingly, the traveling distance of the suction valve 1 can be controlled by the number of steps.
  • Fig. 3 the position of the suction valve 1 is plotted along the horizontal axis, with the rightward direction corresponding to valve opening and the leftward direction corresponding to valve closure.
  • the vertical axis represents the energization direction of the signals S1, S2.
  • the energization direction for producing N poles in the fixed magnetic poles 31, 32 is taken as the positive direction.
  • the solid line in Fig. 3 indicates the signal Sl and the dashed line the signal S2.
  • (a) through (e) indicate the energization states corresponding to (a) through (e) in Fig. 2, and (f) through (i) indicate the energization steps which follow (a) through (e).
  • the energization direction is the reverse direction for both of signals S1 and S2 at (a) in Fig. 3, signal S2 changes to the forward direction and makes a transition to the state (b).
  • signal S1 is changed to the forward direction
  • the state (c) is established.
  • signal S2 is stopped, a transition is made to the state (d).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)
  • Magnetically Actuated Valves (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP90303083A 1989-03-30 1990-03-22 Dispositif de commande pas à pas pour soupape Expired - Lifetime EP0390422B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP80130/89 1989-03-30
JP1080130A JP2639587B2 (ja) 1989-03-30 1989-03-30 バルブのステッピング駆動装置

Publications (2)

Publication Number Publication Date
EP0390422A1 true EP0390422A1 (fr) 1990-10-03
EP0390422B1 EP0390422B1 (fr) 1993-02-24

Family

ID=13709647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90303083A Expired - Lifetime EP0390422B1 (fr) 1989-03-30 1990-03-22 Dispositif de commande pas à pas pour soupape

Country Status (4)

Country Link
US (1) US4984541A (fr)
EP (1) EP0390422B1 (fr)
JP (1) JP2639587B2 (fr)
DE (1) DE69000944T2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055741A1 (fr) * 1997-06-06 1998-12-10 Gründl und Hoffmann GmbH Gesellschaft für elektrotechnische Entwicklungen Dispositif a soupapes pour moteur a combustion interne a commande par soupapes
ITRM20100533A1 (it) * 2010-10-11 2011-01-10 Danilo Ciatti Sistema elettromagnetico di comando delle valvole per motori a combustione
WO2017072617A1 (fr) * 2015-10-29 2017-05-04 Hdm S.R.L. Moteur linéaire électromagnétique

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2579207B2 (ja) * 1988-12-28 1997-02-05 株式会社いすゞセラミックス研究所 バルブのステッピング駆動装置
US5588403A (en) * 1992-11-04 1996-12-31 Williams; Douglas J. Rack and pinion valve operating system
US5515818A (en) * 1993-12-15 1996-05-14 Machine Research Corporation Of Chicago Electromechanical variable valve actuator
US5769043A (en) * 1997-05-08 1998-06-23 Siemens Automotive Corporation Method and apparatus for detecting engine valve motion
US6039014A (en) * 1998-06-01 2000-03-21 Eaton Corporation System and method for regenerative electromagnetic engine valve actuation
JP3715460B2 (ja) * 1999-03-31 2005-11-09 株式会社日立製作所 機関弁の電磁駆動装置
JP3873559B2 (ja) * 2000-01-21 2007-01-24 日産自動車株式会社 エンジンの電磁動弁制御装置
AU2001279781A1 (en) * 2000-07-24 2002-02-05 Compact Dynamics Gmbh Gas-exchange valve control for a valve-controlled internal combustion engine
DE20115060U1 (de) * 2001-09-12 2002-01-31 Trw Deutschland Gmbh Nockenwellenloser Aktuator für Betätigung eines Hubventils
WO2004104380A1 (fr) * 2003-05-26 2004-12-02 Continental Teves Ag & Co. Ohg Mecanisme de commande pour soupape de changement des gaz
WO2004113687A1 (fr) * 2003-06-26 2004-12-29 Continental Teves Ag & Co. Ohg Mecanisme de commande destine a une soupape de changement des gaz
US7270093B2 (en) * 2005-04-19 2007-09-18 Len Development Services Corp. Internal combustion engine with electronic valve actuators and control system therefor
US8037853B2 (en) * 2005-04-19 2011-10-18 Len Development Services Usa, Llc Internal combustion engine with electronic valve actuators and control system therefor
US8191857B2 (en) * 2008-10-09 2012-06-05 Parker-Hannifin Corporation Linear motor valve
FR2984633B1 (fr) * 2011-12-16 2015-11-06 F Q N K Actionneur electromagnetique
US9671034B2 (en) * 2013-01-14 2017-06-06 Dayco Ip Holdings, Llc Piston actuator controlling a valve and method for operating the same
US20240175515A1 (en) * 2022-11-29 2024-05-30 Eto Magnetic Gmbh Bi-stable solenoid device, moving magnet actuator, valve and method for operating the bi-stable solenoid device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568216A (en) * 1943-08-18 1945-03-23 Antonio Peppino Castellini Improvements in electro magnetic actuating mechanisms for valves and like timed moving parts of internal combustion engines
US3894275A (en) * 1973-12-11 1975-07-08 Quebec Centre Rech Ind Linear step motor
FR2377525A1 (fr) * 1977-01-12 1978-08-11 Lucas Industries Ltd Mecanisme de commande d'une soupape champignon de moteur
GB2053575A (en) * 1979-07-06 1981-02-04 Lucas Industries Ltd Solenoid-actuated valves
EP0279265A1 (fr) * 1987-02-10 1988-08-24 INTERATOM Gesellschaft mit beschränkter Haftung Entraînement de soupape avec transmission hydraulique et caractéristique variable grâce à une commande par coulisse

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58183805A (ja) * 1982-04-20 1983-10-27 Honda Motor Co Ltd 内燃機関のバルブ機構
DE3307070C2 (de) * 1983-03-01 1985-11-28 FEV Forschungsgesellschaft für Energietechnik und Verbrennungsmotoren mbH, 5100 Aachen Stelleinrichtung für ein zwischen zwei Endstellungen verstellbares Schaltelement
JPS59169473U (ja) * 1983-04-28 1984-11-13 石川島播磨重工業株式会社 弁
JPH0416633Y2 (fr) * 1986-04-11 1992-04-14
JPS62262650A (ja) * 1986-05-08 1987-11-14 Shibaura Eng Works Co Ltd リニヤパルスモ−タ
JPS62262649A (ja) * 1986-05-08 1987-11-14 Shibaura Eng Works Co Ltd リニヤパルスモ−タ
JPS6360720A (ja) * 1986-09-02 1988-03-16 Fanuc Ltd 射出成形機駆動装置
US4794890A (en) * 1987-03-03 1989-01-03 Magnavox Government And Industrial Electronics Company Electromagnetic valve actuator
US4779582A (en) * 1987-08-12 1988-10-25 General Motors Corporation Bistable electromechanical valve actuator
DE3739891A1 (de) * 1987-11-25 1989-06-08 Porsche Ag Vorrichtung zum betaetigen eines gaswechsel-tellerventils
US4883025A (en) * 1988-02-08 1989-11-28 Magnavox Government And Industrial Electronics Company Potential-magnetic energy driven valve mechanism
JP2579207B2 (ja) * 1988-12-28 1997-02-05 株式会社いすゞセラミックス研究所 バルブのステッピング駆動装置
JP3355676B2 (ja) * 1992-12-01 2002-12-09 株式会社村田製作所 偏向ヨーク

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568216A (en) * 1943-08-18 1945-03-23 Antonio Peppino Castellini Improvements in electro magnetic actuating mechanisms for valves and like timed moving parts of internal combustion engines
US3894275A (en) * 1973-12-11 1975-07-08 Quebec Centre Rech Ind Linear step motor
FR2377525A1 (fr) * 1977-01-12 1978-08-11 Lucas Industries Ltd Mecanisme de commande d'une soupape champignon de moteur
GB2053575A (en) * 1979-07-06 1981-02-04 Lucas Industries Ltd Solenoid-actuated valves
EP0279265A1 (fr) * 1987-02-10 1988-08-24 INTERATOM Gesellschaft mit beschränkter Haftung Entraînement de soupape avec transmission hydraulique et caractéristique variable grâce à une commande par coulisse

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
AUTOMOTIVE ENGINEERING. vol. 96, no. 5, May 1988, WARRENDALE US pages 46 - 53; D.M: KABUT: "Ceramic valve analysis" *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 286 (M-727)(3133) 05 August 1988, & JP-A-63 61705 (NGK) 17 March 1988, *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 141 (E-73)(813) 05 September 1981, & JP-A-56 74080 (RICOH) 19 June 1981, *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998055741A1 (fr) * 1997-06-06 1998-12-10 Gründl und Hoffmann GmbH Gesellschaft für elektrotechnische Entwicklungen Dispositif a soupapes pour moteur a combustion interne a commande par soupapes
ITRM20100533A1 (it) * 2010-10-11 2011-01-10 Danilo Ciatti Sistema elettromagnetico di comando delle valvole per motori a combustione
WO2017072617A1 (fr) * 2015-10-29 2017-05-04 Hdm S.R.L. Moteur linéaire électromagnétique

Also Published As

Publication number Publication date
EP0390422B1 (fr) 1993-02-24
JPH02259210A (ja) 1990-10-22
DE69000944T2 (de) 1993-06-09
DE69000944D1 (de) 1993-04-01
JP2639587B2 (ja) 1997-08-13
US4984541A (en) 1991-01-15

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